On Wikipedia https://en.wikipedia.org/wiki/Maggio_Musicale_Fiorentino
Creation 1933
City Florence, Metropolitan City of Florence, Italy
Country Italy

Maggio Musicale Fiorentino is an annual arts festival in Florence, including a notable opera festival; it was founded in April 1933 by conductor Vittorio Gui with the aim of presenting contemporary and forgotten operas in visually dramatic productions. It was the first music festival in Italy. The first opera presented was Verdi's early Nabucco, his early operas then being rarely staged. It now takes place between late April, May and into June, typically with four operas. wikipedia